EP2183636A1 - Système d'éclairage à diodes électroluminescentes - Google Patents

Système d'éclairage à diodes électroluminescentes

Info

Publication number
EP2183636A1
EP2183636A1 EP08797316A EP08797316A EP2183636A1 EP 2183636 A1 EP2183636 A1 EP 2183636A1 EP 08797316 A EP08797316 A EP 08797316A EP 08797316 A EP08797316 A EP 08797316A EP 2183636 A1 EP2183636 A1 EP 2183636A1
Authority
EP
European Patent Office
Prior art keywords
light
light source
led
rod
luminescent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08797316A
Other languages
German (de)
English (en)
Other versions
EP2183636B1 (fr
EP2183636A4 (fr
Inventor
Arlie R. Conner
Thomas J. Brukilacchio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lumencor Inc
Original Assignee
Lumencor Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40346191&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2183636(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Lumencor Inc filed Critical Lumencor Inc
Priority to EP23179322.5A priority Critical patent/EP4276351A3/fr
Publication of EP2183636A1 publication Critical patent/EP2183636A1/fr
Publication of EP2183636A4 publication Critical patent/EP2183636A4/fr
Application granted granted Critical
Publication of EP2183636B1 publication Critical patent/EP2183636B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0653—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements with wavelength conversion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0669—Endoscope light sources at proximal end of an endoscope
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0684—Endoscope light sources using light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0066—Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2461—Illumination
    • G02B23/2469—Illumination using optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0006—Coupling light into the fibre
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N2005/002—Cooling systems
    • A61N2005/005—Cooling systems for cooling the radiator
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/065—Light sources therefor
    • A61N2005/0651—Diodes
    • A61N2005/0652—Arrays of diodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0613—Apparatus adapted for a specific treatment
    • A61N5/062—Photodynamic therapy, i.e. excitation of an agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/20—Lighting for medical use
    • F21W2131/205—Lighting for medical use for operating theatres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N2021/6417—Spectrofluorimetric devices
    • G01N2021/6419—Excitation at two or more wavelengths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N2021/6482—Sample cells, cuvettes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's
    • G01N2201/0627—Use of several LED's for spectral resolution

Definitions

  • This invention in general, relates to high brightness illumination sources and more particularly to the use of Light Emitting Diodes (LEDs) as a source of illumination
  • LEDs Light Emitting Diodes
  • LEDs Light Emitting Diodes
  • LEDs may provide sufficient illumination to be used to replace more traditional light sources in endoscopic illumination systems
  • LEDs provide much improved lifetime, lower cost of ownership, lower power consumption (enabling some battery operated portable devices), decreased cooling requirements, and freedom form mercury relative to conventional arc lamps Additionally they can be readily modulated which can be a significant advantage in many applications
  • no LED based endoscopic illumination system commercially exists that equals or exceeds the luminous intensity of the compact xenon arc lamp systems
  • the invention described herein has the potential of meeting and exceeding the output of the best arc lamps systems available today BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 shows an embodiment of the light emitting diode illumination system where three spectral coupled sources are combined to provide a high bnghtness light source
  • Figure 2 is a detail of the solid rod lumtnescense material optical system comprised of the luminescent rod, LED excitation sources, heat sinks, and index matched output optic
  • the top view represents a cross sectional view
  • Figure 3 shows an embodiment of the invention with the combined mirror and cooling system
  • Figure 4 shows an alternative embodiment of the invention containing two luminescent rod sources in series
  • Figure 5 shows various alternative cross sectional shapes according to different embodiments of the invention
  • Figure 6 shows three different output coupling optics attached to the luminescent material rod and integrated as part of the rod according to various embodiments of the invention
  • Figure 7 shows a plot of efficiency of coupling light out of the end of the rod assuming different cross sectional shapes (_ circular vs — square) as a function of the index of refraction of the attached optic
  • Figure 8 shows the transmission spectrum of a white light source as a function of wavelength for two thicknesses (1mm and 50 mm) for a 0 15% doped Ce YAG rod,
  • Figure 9 shows a spectral plot of the relative intensity versus wavelength for three sources (blue, green and red) in the system of Figure 1 ,
  • Figure 10 shows a means of combining (A) a laser beam, specifically a direct laser diode, with the other colors in order to increase the color palette of a light engine, and (B) two laser beams according to an embodiment of the invention to create a 6 color light engine (see Figure 13),
  • Figure 11 shows a truncated ball lens for coupling to a luminescent rod according to an embodiment of the invention
  • Figure 12 an end view of a luminescent rod excited by two arrays of LEDs in which there is a column of forced atr that forced between the rod and the LED surface through a controlled airspace according to an embodiment of the invention
  • Figure 13 shows a stx color ltght engine layout, including a luminescent rod, two laser diodes and three other solid state light sources, with dichrotc mirrors to create a single coaxial 6-color beam according to an embodiment of the invention
  • Figure 14 shows a four color fight engine layout including a luminescent rod and three other solid state light sources, with dichroic mirrors to create a single coaxial 4-color beam
  • Each individual light source is collimated so as to be efficiently combined and after color combination the beam is refocused into a light guide for transport to the device or system to be illuminated according to an embodiment of the invention
  • Figure 15 a resulting spectrum with four color bands combined alongside a standard fluorescence microscopy emission filter, according to an embodiment of the invention which provides narrow band illumination regions that do not overlap with the spectral regions of interest to bio-analysis, and
  • Figure 16 shows a six color result, according to an embodiment of the invention to realize a versatile light engine for life science analysis with narrow bands spread across the visible spectrum with nearly the same optical energy available in each band
  • Pnor to LED based systems conventional arc lamp based projection systems were used comprised of a short arc lamp typically of the high pressure mercury, metal halide or xenon lamp variety
  • the primary disadvantage of the short arc technology is lamp life, which is typically in the 500 to 1000 hour range
  • the cost of the arc lamp itself and the service cost to replace the lamps over the life of the product can be many multiples of the original cost of the complete illumination system
  • the arc lamp needs time to stabilize so tends to be left on for hours, even when the actual usage time is minutes, so that 500 hours can be accrued in a few months of usage
  • Additional benefits of the LED technology include reduced power consumption, low voltage operation light intensity stability, no warm-up period is required, ability to control correlated color temperature (CCT) and color rendering index (CRI) 1 and the ability to modulate the source
  • CCT correlated color temperature
  • CRI color rendering index
  • a more conventional approach to producing white light by LEDs is to deposit a phosphor powder, typically of Ce YAG (cerium doped yttnum aluminum garnet Y 3 AI 5 O 12 Ce 3+ ) suspended in an encapsulant material such as silicone, onto a blue LED die or die array with a peak wavelength between about 445 nm and 475 nm
  • the light absorbed by the phosphor is converted to yellow light, which combines with the scattered blue light to produce a spectrum that appears white
  • the apparent color temperature is a function of the density and thickness of the phosphor suspended in the encapsulant While this approach is efficient the amount of white light produced per unit area per unit solid angle is fundamentally limited by the amount of blue light extracted from the blue LED die or die array, the quantum efficiency of the phosphor, the phosphors thermal quenching, and the back scattering, which is a function of the particle size of the phosphor or other luminescent material While it is feasible to place a solid phosphor such as single crystal Ce YAG
  • a white light or multi-color illumination system incorporates a luminescent rod material which is excited along its length by a linear array of LEDs
  • the luminescent matenal is a single crystal
  • the luminescent matenal is a sintered ceramtc Ce YAG (cerium doped yttrium aluminum gamete Y3AI5O1 2 Ce 3 ') and the LEDs are blue GaN based surface emitting devices
  • the green and/or yellow output spectrum from the rod can be coupled to a collection optic which converts the light emitted from the aperture of the rod to a larger dimension with a smaller solid angle
  • the light emitted can be imaged to a fiber bundle or other light transporting medium such as a liquid light guide (LLG)
  • the output of the luminescent rod and collection optic can be combined with the output of other directly coupled LED arrays in the blue
  • Blue and red LED modules can be produced to equal or exceed the b ⁇ ghtness of conventional high bnghtness light sources such as compact xenon arc lamps
  • the efficiency of LEDs in the true green spectrum, especially in the spectral region of 555nm are of comparatively low efficiency and are not sufficiently bright compared to arc lamps
  • light generated from LEDs in the spectral region of 555 nm is achieved by applying a thin layer of directly over LED die emitting blue light
  • the light from the phosphor particles is partially absorbed and partially scattered
  • the amount of white light produced can be increased by increasing the current density to the LED up to the point where the output of the LED rolls over and no longer increases with increasing current
  • the bnghtness of any LED made by in this general configuration is fundamentally limited by the internal and external quantum efficiency of the LED die, the quantum efficiency of the luminescent material, the amount of scattering by the particles, the thermal quenching properties of the die, and the die junction temperature
  • the present invention is not limited by the current density of the LED as the length of the rod matenal can be increased to increase the number of excitation LED die and thereby increasing the luminescence output
  • a high performance LED die with a 1 mm square area coated with a high performance phosphor can produce approximately 200 Lumens with a heat sink temperature near room temperature at the maximum current density ( ⁇ ⁇ before rolling over and no longer producing more light with further increases in current density)
  • Even with extraordinary cooling measures the phosphor-on-LED approach can yield at best green/yellow light densities of 50OmW per square millimeter at best with the current state of the art blue InGaN LEDs
  • a luminescent rod with a 1 mm square cross sectional area and a length of 50 mm can have approximately 100 LEDs exciting the luminescent rod
  • a conservative efficiency of 30% can result in an output of more than an order of magnitude higher photometric power with each LED operating at current densities significantly lower than the maximum current density
  • the length of the rod can be increased along with an increase in the number of LEDs exciting the luminescent rod
  • a means of producing output in the green portion of the spectrum results in higher brightness than can be achieved by even the best xenon short arc lamps
  • the present invention relates to high bnghtness illumination systems
  • the present invention represents an LED based light source for improved illumination systems relative to arc lamp and other LED based light source systems
  • the illumination system 10 of Figure 1 is comprised of one or more LED die or die array modules 12, 24 and 26 spectrally and spatially combined by means such as dichroic beam splitters 42 and 44 coupled to a common source aperture 52 which substantially conserves the etendue or area solid angle index squared product
  • a luminescence rod system couples into an optical fiber bundle to provide the high luminous power and high brightness required for bioanalytical and medical endoscopic applications
  • Other high bnghtness applications include, but are not limited to projection systems industnal illumination photo curing, spot fights and medical photodynamic therapy
  • luminescent material such as single crystal or sintered ceramic Ce YAG and other luminescent materials including (Lui.x.y.a.bYxGd v )3(Ali- /
  • RE is either europtum(ll) or ce ⁇ um(lll) for example CaAISiN 3 Eu 2 ' or CaAd O 4 Si O W sNs Ce 3+ , and M x v+St 12 .
  • the luminescent rod 14 can have the properties of high absorption
  • (n ⁇ 1 46) coupling gel can be applied between the luminescent rod and the half ball lens with resulting 80 to 90% extraction efficiency
  • YAG Ce as the luminescent material and a half ball lens of somewhat higher index, e g Schott type SF6 glass or S- LAH79 from Ohara, as much light as is trapped by the TIR light-guiding mechanism can be extracted, t e all the light that is guided within about a 57 degree half angle within the YAG medium
  • the output spectrum of the Ce YAG rod source can cover the range between about 500 nm and 700 nm, with the predominant contribution in the green spectrum centered around 555 nm
  • the combination of the light from a luminescent rod with that from a blue LED module 24 can produce white light suitable for many applications
  • the relative spectral content ts typically required to result in a high color rendering index (CRI) on the order of 85 or greater To accomplish this it is necessary to add additional light in the red spectral region from a third LED source module 26
  • dtchroic beam splitter 42 can transmit the red fight of LED module 26 and reflect the blue light of LED module 24
  • Dichroic beam splitter 44 can transmit the combined blue and red spectrum of combined LED modules 26 and 24 and reflect the green or yellow light of LED module 12
  • the combined white light spectrum from LED modules 12, 24, and 26 can then be imaged by lens elements 46 and 50 to fill the input aperture 52 of fiber optic light bundle 54
  • heat sinks 12 25, and 34 of Figure 1 can be made out of any high thermal conductivity material including but not limited to copper and aluminum
  • the LED or LED arrays 16, 30, and 38 can be attached to LED printed circuit boards (PCBs) 18, 28, and 36 which can in turn be thermally and mechanically attached to heat sinks 12, 25 and 34 respectively
  • the PCBs can be made out of a high thermal conductivity material including but not limited to copper, diamond, aluminum, or composite materials
  • the thermal resistance between the back side of the LED die or die arrays can be minimized by direct eutectic attachment soldenng or a thin layer of thermally conductive epoxy such as Diemat 6050
  • the high thermal conductivity PCBs can act as heat spreaders thereby reducing the heat flux density into the heat sinks 12, 25 and 34
  • the heat sinks can be cooled by direct convection with air, conduction with various coolant fluids such as water, or radiation into the surrounding environment Heat pipes of various constructions have also been
  • the luminescent rod 14 can be a single crystal
  • the luminescent rod 14 can be a transparent sintered polycrystalline Ce YAG
  • the luminescent rod 14 can be characterized by high absorption in a spectral region such as blue in the region of 460 nm and very low extinction for wavelengths greater than the excitation wavelength band above 5Q0nm to 510nm
  • the rod material 14 can also be characterized by exhibiting luminescence of the absorbed excitation light with high quantum yield
  • the LED array 16 can be comprised of a blue LED die such as those manufactured by CREE lnc called
  • the light from the LED array can be transmitted through the outer wall of luminescent rod 14
  • the absorption coefficient of the luminescent rod 14 can be chosen to be fairly high, i e it can be doped to a level resulting in substantially all of the blue light being absorbed within the dimension of the rod prior to exiting the rod through its other side
  • mirrors 72 can be positioned with a reflective surface close to the rod so as to cause the excitation light to pass back into the rod one or more times to maximize absorption by the rod
  • the reflectivity of the LED dte is on the order of 80%, which can also act to couple light that was not absorbed on the first pass through the rod back into it for another opportunity to be absorbed
  • the light can take multiple passes to be substantially absorbed Given the finite reflectivity of the mirrors 72 and diffuse reflectivity of the LED die 16 it can be best to chose an extinction that can result in the
  • the luminescent light generated within the rod 14 would be substantially isotropic and thus would travel equally in all directions Thus half of the light that is bound to the rod by TIR would travel in a direction opposite to the output aperture 62 toward mirror 66 which can act to send the light emitted in that direction back toward output aperture 62, thereby substantially doubling the light reaching output aperture 62
  • the mirror can also be effectively coated directly onto the end face of rod 14 in the vicinity of mirror 66
  • FIG. 3 shows an alternative embodiment 80 of the mirror elements 66 of Figure 2 compnsed of modified mirror elements 82 containing the addition of small holes 84 through which high pressure air can cool rod 14 by high pressure air impingement
  • the holes can be sufficiently small as to minimally affect the mirrored surface area of mirrors 82 Htgh pressure air impingement has several times the film coefficient and thus heat transfer as compared to standard convected low pressure atr
  • the effect of the slight increase in the index of refraction of the medium surrounding rod 14 on TIR can be minimal
  • a direct contact cooling fluid was used without the sides of the rod being reflective, the higher than air index of refraction of the fluid can result in more loss out through the sides due to the decreased TIR internal angle thereby reducing overall LED module efficiency
  • the reason it can be important to provide a means of removing heat build up from the rod is that there can be a small but finite heat absorption, convection and conduction to the rod from the LED array 16 that can cause an increase in temperature of the rod if there were no
  • Figure 4 shows an alternative embodiment 120 of LED module 12 of Figure 1 where two modules 12 have been positioned in sequence to form a single multi-spectrum source
  • rod 122 of 120 can be made of a luminescent material with properties similar to those described for rod 14 for which the excitation band is within the long wavelength ultraviolet spectrum in the region of 240nm to 420nm
  • the high transmission region of the material can be in wavelengths longer than 420nm and its luminescence can be in the blue to blue-green spectral region
  • rod 124 can have similar absorption properties but comprise luminescence in the green to red region of the spectrum
  • Both rods 122 and 124 can be characterized by high transmission in the spectral region containing wavelengths longer that 420nm
  • the mirror 66 can act to reflect any light transmitted in the direction opposite output coupler 22 back toward 22
  • LED light module 120 can contain the full and desired spectrum of the white light source and can require neither supplemental LED modules 24 and 26 of Figure 1 nor dichroic beam splitters 42 and 44
  • an index matching material between the two rods 122 and 124 such as melted Schott SF6 glass or other suitable index matching matenal can be used
  • a single matenal or ceramic such as YAG (ytt ⁇ um aluminum garnet) can use different dopants in the regions corresponding to rods 122 and 124 such that the rod is continuous and there is no need for an index matching medium
  • more than one dopant can be used evenly over the entire length of a single rod assuming the dopants did not interfere and reduce quantum efficiency
  • the length of the rods and excitation LED arrays can be increased to achieve higher flux out of collection optic 22
  • the length of the rods and excitation LED arrays can be increased to achieve higher flux out of collection optic 22
  • rods including but not limited to circular, square, rectangular and multiple sided polygons such as a hexagon and octagon are shown in Figure 5
  • the optical concentrator that can be index matched to one of the rod configurations can have a similar cross sectional shape
  • a rectangular or square CPC or taper can be used
  • a theta by theta CPC comprised of a taper coupled to a CPC such as descnbed by Welford and Winston ("High Collection Nonimaging Optics , W T Welford and R Winston, Academic Press, 1989) can be used
  • Figure 6 shows various configurations 100 of a combination of luminescent rod and output concentrators
  • the rods 102, 108, and 114 can be index matched to output couplers in the form of a taper 104 CPC 110, or combined theta by theta taper and CPC 116
  • the concentrators can be made out of a matenal that is transparent and of similar index of refraction and can be coupled by means of an index matching medium
  • the two components composing a rod and concentrator can be mated by heating the components under pressure, causing them to melt together
  • the rod and concentrator can be made out of the same material such as ceramic (phosphor particles sintered at temperatures on the order of 1800' Celsius and under pressure causing the material to become transparent and substantially homogeneous) such as Ce YAG which can be doped in the region of the rod and not doped in the region of the concentrator thereby eliminating the need for index matching.
  • Figure 7 shows a plot of index of refraction of the concentrator versus coupling efficiency for the case of a Ce YAG rod which has an index of refraction on the order of 1 82 for two rod geometries circular and square in cross section
  • the out-coupling efficiency into atr (index of refraction 1) of 30% assumes that all the light emitted by the LED die is absorbed within the rod and that one end of the rod ts coated wtth a mirror with reflectivity of 100%
  • the efficiency can be at least doubled up to the limit of the light-guided available efficiency of about 70% for a luminescent rod having this index, by index matching to a concentrator with an index of refraction approaching that of the rod
  • the data assumes that the output face of the concentrator is coated to minimize losses due to Fresnel reflections at the air/glass interface
  • Figure 8 shows empirical data for a white light source transmitted through the side of a Ce YAG rod of 1 mm thickness and guided down a length of 50 mm
  • the Cerium doping was 0 15%
  • the data shows that for the 1 mm path length more than 90% of the blue light was absorbed
  • the 50 mm rod was not coated, so the maximum expected transmission of blue light going into the rod would be on the order of 84% due to Fresnel reflection which is observed at a wavelength of about 400nm where the Ce YAG rod is substantially transparent
  • the fact that the output is above the expected maximum transmission for wavelengths greater than 500 nm is due to the contribution from the luminescent tight emitted by the absorbed blue light in the incident white light
  • the broader absorption band shown in the 50 mm length is due to the fact that Beer's Law ts acting over 50 times the length exponentially It is also apparent that the material does exhibit some degree of self absorption for which some of the absorbed light emitted as phosphorescence is absorbed through the length Thus
  • the rod might easily absorb 20 watts and only re-emit 15 W due to Stokes shift and material inefficiencies, leading to a fast heating unless rather extreme cooling measures are undertaken
  • a high pressure fan can be direct a thin column of atr into the gap between opposing surfaces (LED line arrays on opposing sides) as shown in Figure 12
  • the air cooling is favored if the LEDs can be spaced apart from the luminescent rod by about 200 microns (see Figure 12)
  • the rod may be any shape
  • the rod is preferably square and polished highly with minimum chips so as to pass the maximum light but without needing for example a 'laser grade' finish
  • the cost of the rod is high but wtth reduced surface tolerance specifications can be fabricated with relative ease and therefore such a component can be considered commercially viable
  • the density may be increased and the length of the rod shortened and cost reduced (and the spectrum consequently widened due to reduced self absorption) if the thermal load can be managed
  • Other methods that can be used to manage the thermal load include contacting a suitable heat-spreading material, such as a large perforated metal fin or a ceramic material placed in contact with the rod
  • thermal consideration can be a primary concern in the overall design
  • Figure 9 shows the combined spectrum of the system of Figure 1 with the thick black vertical lines representing the spectral region of the dichroic beam splitters
  • the driving current to the individual sources can be adjusted to result in a CRI greater than 90 at a CCT on the order of 570CT Kelvin which is consistent with the values typical of short arc Xenon lamps
  • the blue spectaim shown here is comprised of three blue LEDs with peak wavelengths centered around 445nm, 457nm and 470nm
  • the red band is comprised of the combination of LED center wavelengths peaked near 630nm and 650nm
  • the effect of increasing the spectral widths in the blue and red spectral regions is primarily to increase the
  • the luminescence systems can be used for irradiating bioanalytical instrumentation including wells containing chemicals for inducing reactions or detecting reactants or products of chemical reactions
  • the btoanalytical instrumentation can include a light source and fiber optic systems for irradiating analytes within capillaries with selected wavelengths of light and detecting luminescence produced by the analytes within the capillanes
  • Separation by electrophoresis is based on differences in solute velocity in an electric field
  • the velocity of a charged analyte is a function of its electrophoretic mobility and the applied voltage
  • the method of electrophoresis is used in a number of different techniques including capillary gel electrophoresis, capillary zone electrophoresis, mtcellar electrokinetic chromatography, capillary electro chromatography, isotachophorests and isoelectnc focusing
  • analyte in a particular medium is constant and characteristic of that analyte
  • the analytes mobility is a result of two factors
  • the analyte is attracted to the electrode of opposite charge, pulling it through the medium
  • frictional forces try to prevent the analyte moving toward the charge
  • the balance of these forces determines the actual overall mobility of the analyte
  • An analytes size, polarity and number of electnc charge(s), relative hydrophobictty and ionic strength determine how rapidly an electric fiefd can move the analyte through a medium
  • a buffer is used to assist the flow of the analyte relative to the field
  • the buffer's chemical composition pH temperature and concentration alter the mobility of the analyte
  • Many important biological molecules such as amino acids, peptides, proteins, nucleotides, and nucleic a ⁇ ds, posses ionizable groups and, therefore, at any given pH, exist in solution as electrically charged species
  • Gel electrophoresis is a method that separates molecules such as DNA or proteins on the basis of their physical properties
  • a gel is a solid colloid
  • gel electrophoresis refers to the technique in which molecules are forced to cross a span of gel, motivated by an electrical current Activated electrodes at either end of the gel provide the electric field and thus the driving force for the migration of the analyte
  • electrophoresis molecules are forced to move through the pores in the gel when the electrical current is applied
  • Their rate of migration, through the induced electnc field depends on the strength of the field, their charge, their size and the shape of the molecules the relative hydrophobicity of the molecules, and on the ionic strength and temperature of the buffer in which the molecules are moving
  • gel electrophoresis One use of gel electrophoresis is the identification of particular DNA molecules by the band patterns they yield in gel electrophoresis, after being cut with various restnction enzymes Viral DNA, plasmid DNA, and particular segments of chromosomal DNA can all be identified in this way Another use is the isolation and punftcatton of individual DNA fragments containing interesting genes, which can be recovered from the gel with full biological activity
  • CZE Capillary Zone Electrophoresis
  • Mtcroftufdic systems comprised of microfluidic chips automated reagent delivery apparatus and detection instrumentation are designed to minimize the users' effort in reagent delivery reagent dilution and/or mixing, initiating chemical reactions and detecting those chemical reactions in small volumes within highly automated environments
  • fluorescence is a commonly used detection format It is a sensitive and robust method for detecting enzyme assays, immunoassays, polymerase chain reaction (PCR), quantitative PCR, genomic sequencing among many other important chemical reactions
  • PCR polymerase chain reaction
  • genomic sequencing among many other important chemical reactions
  • Both homogeneous and heterogeneous reactions are suited to such devices and analysis is not limited by whether the reaction takes place in free solution or on a solid support or within a narrow pore
  • microfluidic devices are produced by etching molding or embossing channels and wells into solid substrates (glass silicon, plastic, etc ) Numerous layers of the device can be fabricated and then the layers assembled to form the finaf anafysfs tool Channels
  • the present invention consists of one or more light sources in the form of a luminescent light pipe referred to herein as a lamp, in conjunction with relay optics for luminescence collection from an analyte forming a luminescence system for a volume interrogation apparatus wherein the interaction of light with a chemical species located within or supported on a solution volume can be the measure of the presence or quantitation of an analyte Luminescence is defined as light not generated by high temperature alone, typical of incandescence, including but not limited to fluorescence and phosphorescence Where high temperatures are defined as above approximately 2000° K
  • the analyte can be part of a reaction involving species including biopolymers such as, oligonucleotides (DNA RNA iRNA, StRNA), proteins (including antibodies, enzymes agonists antigens hormones toxins), oligosaccharides and non polymeric species such as steroids, lipids, phospholipids, small organic signaling molecules (e g , retinoic acid
  • a luminescence system in conjunction with relay optics for luminescence collection form a flexible and efficient system for a capillary/fluorescence apparatus
  • a plurality of light sources and fiber optic systems separately and simultaneously irradiate a plurality of capillaries with selected wavelengths of light and the fluorescence produced by the molecules flowing within the capillaries can be separately and simultaneously detected 'Simultaneously is herein defined as occurring close in time
  • Two light pipes can irradiate two capillaries at the same time and the fluorescence from the molecules in one of the capillaries can be delayed due to physical or chemical effects relating to absorption, phosphorescence and/or fluorescence resulting in a delay in the fluorescence from the molecules in one of the capillaries.
  • a luminescence and collection system can be adjusted for uniform luminescence of multiple capillanes or wells or a large area including numerous wells, spots or channels as 'detection volumes'
  • luminescence systems can irradiate an array of channels in an array of capillaries
  • an array of channels can be etched molded embossed into the capillaries
  • a set of wells intimately connected to fluidic conduits can be stepped along the length of the flutdic conduit such that they can be interrogated at numerous sites for the purposes of creating a map or image of the reacting species
  • a luminescence and collection system can irradiate an array of wells, spots and or an array of channels (be they etched, molded or embossed) or a set of wells intimately connected to fluidtc conduits such that they can be interrogated at numerous sites for the purposes of creating a map or image of the reacting species
  • a luminescence and collection system can irradiate homogeneous reactions within ftuidic conduits or reservoirs, to irradiate heterogeneous reactions on the surface of flutdic conduits or reservoirs, to irradiate homogeneous or heterogeneous reactions on the surface of or within the pores of a porous reaction support
  • a luminescence and collection system can emit multiple colors as desired In an embodiment of the present invention, a luminescence and collection system can be pulsed on and off as desired to reduce heat generation In an embodiment of the present invention a luminescence and collection system can be pulsed on and off to allow time-based fluorescence detection
  • a luminescence and collection system can detect one or a number of reactions within the detected volume or volumes
  • the narrow band source of the light pipe driven analyzer provides better specificity, higher sensitivity and lower backgrounds signals
  • the light pipe driven analyzer easily accommodates multiple wavelengths by additions of senally connected components
  • a luminescence and collection system can be pulsed on an off as desired to reduce or control heat generation and to allow time- based fluorescence detection [0060J
  • luminescence systems can irradiate homogeneous reactions withtn fluidic conduits or reservoirs
  • luminescence systems can irradiate heterogeneous reactions on the surface of fluidic conduits or reservoirs
  • luminescence systems can irradiate homogeneous or heterogeneous reactions on the surface of or withtn the pores of a porous reaction support
  • the light engine can be constructed to generate one or more colors
  • Figure 14 illustrates a four color light engine consisting of LEDs 1411 and a luminescent rod 1410
  • the output of each light source is filtered to generated the specified spectral band using a band pass filter 1430, 1440, 1450 and 1460 and then combined into one common optical path using dichroic filters 1443, 1453, and 1463 positioned at 45 degrees
  • the output from the rod is first out coupled using a truncated ball lens or other light extracting element 1420 and magnified by a piano convex tens 1421 This light is then cotlimated by a asphere piano convex lens 1442 Similarly the output from the other light sources is collimated using aspheres 1452, 1462, and 1472
  • the asphere lenses are designed so that the collimated light is generated and can pass through the bandpass filters at nearly normal incidence a requirement for optimum filter performance
  • Other embodiments
  • FIG. 13 an embodiment is shown for a six color engine
  • a blue LED and collimating optic 1330 is combined with a yellow LED and collimating optic 1360 and a cyan LED and colfimating optic 1340 and these three wavebands combined with a luminescent rod and its associated collimating optic 1350, where only the light emitted by the luminescent rod 1350 is shown as beam 1390 (dotted line)
  • Such four color combination is further combined with two laser diodes 1310 and all six color bands focused into a light guide 1320 as described in Figure 10
  • a laser diode 1010 which might be preferably selected from a wavelength range of 630 to 650nm, is pointed at a small mirror 1040 to direct the light 1041 substantially in the opposite direction from the main optical axis 1020 of the light engine Said main optical axis 1020 already contains at least one color component such as will be generated by using a luminescent rod excited by LED sources
  • the red laser diode beam shape is sufficiently wide to cover a substantial portion of the collimator lens 1045 and the distance of the divergent laser beam is substantially equal to the focal length of such colltmati ⁇ g lens
  • the collimator may be a molded aspherical lens to reduce spherical aberrations Directly thereafter the collimated red laser beam strikes a dfchroic mirror 1030 which is tilted slightly in the range of 2 to 8 degrees so as to redirect the laser beam back into the collimating tens 1045, at near normal incidence, i e superimposed 1043 and collinearly
  • two laser diodes 1060, 1061 can be combined as explained in Figure 10(A), and the small apparent source size allows these beams to be combined by a knife-edge (prism) 1042 such that both beams 1046, 1047 can be refocused using dichroic mirrors 1031, 1032 into a suitably large light guide
  • a 2mm prism can be used with two red laser diodes 1060 to spatially combine the two sources (which may have different or identical wavelength output) into a 3mm diameter entrance of a liquid light guide
  • An alternative embodiment can use a larger prism with apparent source positions coming from both sides of the optical centeriine such that two different wavelength laser beams can be directed toward the collimator lens, and after that two different dichroic mirrors utilized to reflect the two independent lasers back into the main optical axis collinearly and overlappmgly
  • a 405nm laser diode can be directed as in Figure 10(A), but from the opposing side and with a tilted di
  • the two laser diodes combined can be of different colors
  • the combining can be with a colored prism, holographic or other dichroic
  • each of the independent laser diodes can be directly modulated turned on and off at high speed
  • a bandpass filter or other optical element can be inserted between each laser and the combining elements, for instance a heat rejection filter to further improve the light source for suitability for any intended application
  • FIG. 11 shows a side view of the luminescent rod 1130, where a mirror 1110 is positioned at one end of the luminescent rod 1130, and brackets 1120 constrain the rod 1130 Luminescence (dotted line) 1180 from the rod 1130 exit the aperture and the coupling gel 1140 through the conical seat 1150 and the dome 1160 along the mam axis compressive force 1170
  • the dome is shown with the truncated ball lens 1190
  • the dome is sufficiently larger on the order of 3 to 20 times larger in diameter than the rod cross-section, the light will escape normal to the ray within the crystal and emission of about 57 degree half angle can be expected for instance for YAG Ce Out-coupling is defined as application of the same or similar index material that is 3 to 20 times larger in diameter than the rod cross section which can be shaped like
  • Figure 12 shows an end view of a luminescent rod 12S0 excited by two arrays of LEDs 1230 in which there is a column of forced air 1210 that forced between the luminescent rod 1250 and the LED surface 1240 through a controlled airspace according to an embodiment of the invention
  • the LED 1230 is bonded to a metal core circuit board 1220 which acts as a heat sink and a wire bond 1260 between the LED 1230 and the circuit board 1220.
  • the magnification can then be further optically corrected to a perfect colltmation which can be color-combtned ustng standard dtchrotc edge combiners and recondensed to a spot
  • the spot can be a liquid light guide
  • the spot can be a fiber bundle
  • the spot can form the pupil of a Kohler illuminator
  • a desirable high efficiency and highly effective illumination system for fluorescent microscopy can be formed by this color combined section in combination with the optics for Kohler adaptation
  • the etendue of a single LED can be perfectly matched to the etendue of a liquid light guide
  • the numerical aperture (NA) can be in the range from 02 up to about 0 6 which can be coupled to the microscope by said Kohfer adapter
  • the image of the ltghtsource at the refocused spot can be scrambled or made homogeneous by means of a integrating or mixing rod or a mirror tunnel, which can be then be used within an Abbe illumination system.
  • a rod with 0 8mm square cross-section is coupled to a truncated ball lens and further magnified by a small plano-convex lens, finally collimated by a 38mm focal length (FL) asphere
  • FL focal length
  • Figure 14 shows that at the refocus, a rectangular image of about 3 6mm square is obtained, appropriate for alignment and optical tolerance buildups
  • Figure 13 shows that launching rays within 55 degrees in the YAG, 40% can be transferred into the LLG fn Figure 15, a representative output from a four color light engine is provided
  • the specific colors (solid line) shown are UV 1510(395 nm), 1520Cyan (485 nm), 1530 Green (560 nm), and 1540 Red (650 nm)
  • Such a range of colors can be generated by a combination of diode lasers LEDs and luminescent light pipes
  • the band positions and bandwidths for each color can be adjusted for a specific application
  • the output can consist of just color or a mix of colors turned on in any order with any intensity for any length of time
  • the output of the light engine can be used to excite any fluorescent label
  • the specific colors shown are particularly well suited to excite DAPI, FITC, Cy3 and CyS respectively, because these colors overlap well the absorption bands of the labels Other dyes can also be excited by these colors
  • the light engine can be engineered to generate a different mix of colors needed to excite labels with different absorption bands
  • the emission from each label is filtered by an emission filter before being recorded by a detector such as a CCD camera
  • a detector such as a CCD camera
  • the profile for a four band emitter is shown (dotted line)
  • the spectral output of the light engine is precisely aligned with the emission filter so that the labels are excited and fluorescence is detected with maximum signal to noise
  • the output of the light engine can be engineered for a specific emission band filter or collection of emission band filters to realize maximum signal to noise Maximum signal is achieved by maximizing the fluorescence signal level which is due the absorbance of the excitation light and bandwidth of the emission filter Minimum noise is realized by incorporating bandpass filters in the light engine (shown in Figure 14) In this manner, the excitation light is typically reduced by 6 to 12 orders of magnitude at the detector
  • Figure 16 shows a representative output from a six color light engine according to an embodiment of the invention (Figure 13) In Figure 16, the specific colors shown are
  • a range of colors can be generated by a combination of diode lasers, LEDs and luminescent light pipes
  • the band positions can be adjusted for a specific application
  • the bandwidths for each color can be adjusted for a specific application
  • the output can consist of just color or a mix of colors
  • the output can be turned on in any order for any length of time
  • the output intensity can be varied for any length of time
  • the etendue of the rod is approximately 4 74 whereas the etendue of the target liquid light guide, restricting the NA output to 0 30 is a value around 1 9 A collection efficiency of 40% is the most which can be expected
  • the rod is slightly oversized (86% is the maximum for circular collection from a square)

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Abstract

L'invention concerne, dans divers modes de réalisation, une construction unique pour des diodes électroluminescentes (LED) avec au moins une tige luminescente et des éléments optiques d'extraction qui est utilisée afin de générer diverses sources lumineuses à forte brillance avec différents spectres d'émission. Dans un mode de réalisation de l'invention, un refroidissement forcé par circulation d'air est utilisé pour refroidir la tige luminescente. Dans un mode de réalisation de l'invention, la lumière interne totalement réfléchie peut être redirigée vers l'extérieur et refocalisée. Dans un autre mode de réalisation de l'invention, la lumière émise par la tige luminescente est couplée en sortie pour une utilisation dans diverses applications. Dans divers modes de réalisation de l'invention, une pluralité de couleurs indépendantes à bande étroite peut être combinée de manière coaxiale.
EP08797316.0A 2007-08-06 2008-08-06 Système d'éclairage à diodes électroluminescentes Active EP2183636B1 (fr)

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US20110116261A1 (en) 2011-05-19
US8098375B2 (en) 2012-01-17
US20090040523A1 (en) 2009-02-12
US9068703B2 (en) 2015-06-30
EP2183636B1 (fr) 2023-06-21
WO2009021079A1 (fr) 2009-02-12
US9574722B2 (en) 2017-02-21
EP2183636A4 (fr) 2011-11-09
US8279442B2 (en) 2012-10-02
US8629982B2 (en) 2014-01-14
US20120307514A1 (en) 2012-12-06
US9062832B2 (en) 2015-06-23
US9395055B2 (en) 2016-07-19
US8493564B2 (en) 2013-07-23
US20140119006A1 (en) 2014-05-01
EP4276351A3 (fr) 2024-01-03
US20150267897A1 (en) 2015-09-24
US8525999B2 (en) 2013-09-03
US20130284943A1 (en) 2013-10-31
US7898665B2 (en) 2011-03-01
US20140098560A1 (en) 2014-04-10
EP4276351A2 (fr) 2023-11-15
US20120106192A1 (en) 2012-05-03
US20150276153A1 (en) 2015-10-01
US20130334440A1 (en) 2013-12-19
US20090040754A1 (en) 2009-02-12
US8625097B2 (en) 2014-01-07

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